The International Electrotechnical Commission (IEC) TC 120 Electrical Energy Storage (EES) systems has recently released and implemented three international standards, specifically:
- IEC TS 62933-2-3:2025 Electric Energy Storage (EES) Systems – Part 2-3: Unit parameters and testing methods – Performance assessment test during site operation
- IEC TR 62933-3-200:2025 Electrical energy storage (EES) systems – Part 3-200: Planning and performance assessment of electrical energy storage systems – Design principles of electrochemical based EES systems
- IEC 62933-4-2:2025 Electric energy storage (EES) systems – Part 4-2: Guidance on environmental issues – Assessment of the environmental impact of battery failure in an electrochemical based storage system
The international standard IEC TS 62933-2-3:2025 was officially approved for development in August 2022 and developed under the leadership of Shanghai Electric Power Research Institute (SEPRI) as the convener, in collaboration with experts from State-Grid Shanghai Electric Power Engineering Co., Ltd., as well as multiple countries including Canada, Australia, and Italy. Over the 33-month development process, SEPRI organized more than 20 international and domestic technical meetings and conducted extensive field research across multiple Chinese energy storage projects. The standard specifies the unit parameters and testing methods that validate and assess the performance of EES systems after commissioning, which fills the international standardization gap for this field and further improves the IEC’s technical standard framework for electrical energy storage.
Additionally, the international standard IEC TR 62933-3-200:2025 presents an overview and design cases of electrochemical based EES systems in power generation side, transmission and distribution side, and customer side. Furthermore, design principles for electrochemical based EES systems such as sizing and selection of subsystems, integration scheme, site and layout, and system safety measures are provided.
Furthermore, the standard IEC 62933-4-2:2025, initiated in 2020, was spearheaded by State Grid China Electric Power Research Institute, with joint efforts of experts from over 10 countries including the United States, Switzerland, Japan, South Korea, Germany, Australia, and the United Kingdom. The standard addresses the environmental impacts of battery failures in EES systems and provides comprehensive risk evaluation guidelines by establishing a technology-specific classification framework, standardized failure categories, and environmental assessment procedures. As the electrochemical energy storage undergoes rapid global deployment, the standard’s unified risk assessment specifications for system design and operation will critically support the high-quality development of emerging storage technologies and facilitate the worldwide energy transition.
In conclusion, these three international standards comprehensively address the application requirements of EES systems and will serve as critical technical references for global manufacturers, end-users, and third-party organizations in product development, engineering design, and system operation and maintenance.
Chinese source of the article: https://www.samr.gov.cn:8085/xw/sj/art/2025/art_b2f3d5ed25b7482eb06040d13a8e614e.html
